Xperia z1 touch screen problem

[Ndzz]

After the bug fix update of 4.4.4 kitkat there is a problem in the phone. When I use the phone for around 10-30 mins the screen fails to register my finger and if I type on keyboard some other kind of word gets typed. Please help me if this is a software bug or my hardware problem. This problem temporarily fixed when I lock my screen and unlock again.

Watch "Xperia z1 touch screen problem" on YouTube - Xperia z1 touch screen problem: https://youtu.be/RfpRRjAnDs8
Here I have uploaded a video demonstrating the problem.
Thanks in advance.

[Uliwooly]

Reinstall the latest update with Pcc

[Ndzz]

Does it even fix cuz reinstall previously many times...

[Ndzz]

The bug is not fixed yet I reinstalled it through pcc @uliwooly

[Uliwooly]

Contact your local Xperia Care as it could be a hardware issue

http://support.sonymobile.com/global-en/contactUs/